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How to deserialize an array of two lists in Jackson

I have an array of two lists. Each list contains objects. The objects in the first list are different from the objects in the second list. In JSON it looks like this:

[  
    {  
        "domains":  
        [  
            {  
                "attrb1": "aaaa",  
                "attrb2": "bbbb"  
            },
            {  
                "attrb1": "cccc",  
                "attrb2": "dddd"  
            }  
        ]  
    },  
    {     
        "terms":  
        [  
            {  
                "attrb1": "cccc",  
                "attrb2": "dddd"  
            }  
        ]  
    }  
]

I saved this JSON string in the initial-elements-v02.json file, and I was thinking about something similar to deserialize it:

final ObjectMapper mapper = new ObjectMapper();

List<List<Object>> glossaryElements = null;
   try {
       glossaryElements = mapper.readValue(
               arg0.resourceAsStream("initial-elements-v02.json"),
               new TypeReference<ListList<<Object>>>() {
               });

Thank!
Evgeny

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1 answer


According to data binding with Generics , I would build from innermost to outermost

Map<String, String>

List<Map<String, String>>

Map<String, List<Map<String, String>>>

List<Map<String, List<Map<String, String>>>>

and then use this



List<Map<String, List<Map<String, String>>>> glossaryElements = null;
glossaryElements = mapper.readValue(
        arg0.resourceAsStream("initial-elements-v02.json"),
        new TypeReference<List<Map<String, List<Map<String, String>>>>>() {});

If initial-elements-v02.json

is the filename, I think you can also use

new File("initial-elements-v02.json")
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